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L-Carnitine is an amino acid derivative naturally produced by the body, but factors like age and lifestyle can mean we can't always maintain optimal levels in our bodies

The results showed that a genetic variant in the GRIK2 gene was more common in people with ME/CFS, and that the gene expression for that gene was decreased by 10-fold in patients compared to controls.[ref] Related article: Glutamate receptor gene variants Circadian clock gene, NPAS2: The study mentioned above also identified a circadian clock gene variant as differentially expressed (10-fold difference) and a variant in the gene as increasing susceptibility to ME/CFS.[ref] Rare mutations: A 2025 Stanford study using the HEAL2 deep learning framework analyzed whole genome sequences from 1,075 ME/CFS patients

Two uncontrolled studies conducted in participants with cirrhosis found that L-carnitine supplementation was safe to use at doses of 0.9 to 1.2 g/day for eight weeks (125) and 1 g/day for 24 weeks (126) and might be considered to control the frequency of cramps

Lysine is also a precursor of L-carnitine, an amino acid derivative needed to convert fatty acids into energy

GLP-1 RAs